perf(core): speed up packedTileUpdates (Uint32 pairs, no tile wrappers) (#3255)

## Description
Reduces CPU + GC pressure from tile update serialization.

**What changed**
- Switched `packedTileUpdates` from `BigUint64Array` (BigInt packing) to
`Uint32Array` `[tileRef, state]` pairs, updating `GameView` ingestion.
- Updated tile state to use `GameMap.tileState(tile)` and
`GameMap.updateTile(tile, state)`.
- Removed per-tile `GameUpdateType.Tile` wrapper allocations by
recording raw `(tile, state)` pairs in `GameImpl` and draining them via
`drainPackedTileUpdates()` in `GameRunner`.

**Why it’s faster**
- Avoids BigInt and pack/unpack.
- Avoids per-tile object allocations.

**Compatibility**
- Wire format change: `packedTileUpdates` is now `Uint32Array` pairs
instead of `BigUint64Array`.

## Please complete the following:

- [ ] I have added screenshots for all UI updates
- [ ] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [ ] I have added relevant tests to the test directory
- [ ] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

DISCORD_USERNAME

src/core/game/Game.ts

@@ -766,6 +766,7 @@ export interface Game extends GameMap {
   ticks(): Tick;
   inSpawnPhase(): boolean;
   executeNextTick(): GameUpdates;
+  drainPackedTileUpdates(): Uint32Array;
   setWinner(winner: Player | Team, allPlayersStats: AllPlayersStats): void;
   getWinner(): Player | Team | null;
   config(): Config;